Hi, i know i'm a newbie but you can trust me , this thing was invented by me and first tested on my own car, it's a 10 minute job... since then some other guys have done it too and everybody is pleased...there's no risk for the engine and if the car is de-EGR'd it will work better than with a new genuine MAF, here's the theory:
the fact is that a good MAF will output from 50-60 at idle to around 600 at full throttle which is a linear grow together with the revs from 0.8 - 1.1V to 5V at max. ... IF the EGR is blanked the MAF lost it's main purpose but it will still disturb the management if it's faulty... now, the trick is that it's signal can be emulated using the TP sensor's track 1 signal instead of it cos this is exactly from around 1V to 5V according to the throttle position, this is doable by splicing into the wire from red plug C0158 pin 11(brown/orange wire) and bridging it to black plug C0658 pin 12(white/green wire)...if you turn the ECU upside-down the two last wires at the right corner of each plug... and leave the MAF unplugged.... then the ECU will get a nice linear growing signal exactly as from a good MAF .... since my last MAF 'died' that's what I did to my car and it's working a treat
if you want to do the mod to not mix pins verify in RAVE - Electrical library - Connector views
IMPORTANT with that mod is to not forget to replace the air filter regularly...that's all
i have an improvised bench made from old harnesses as i can emulate the Td5 management's inputs/outputs like they are in reality and the outputs to the wastegate modulator and injector management are the same with this mod like with a new MAF even if there are small differences in the inputs...when i said "linear" i didnt mean graphicly cos i know that this way is quite logaritmic..i should have said "constant" or something(forgive me english is my third language)
the MAF on Td5 is mainly for EGR controll as the airflow is different than with bypassed EGR cos it's dependent on exhaust gas back pressure too... that's why the engineers used the MAF and this mod is suitable only for de-EGR'd cars... with only unplugged MAF the ECU goes on a default value which is not the best, so does if the MAF has erratic inputs... this mod is tested and working well without any problems and it's an option for those who can't afford to put a new MAF once a year cos there are cases when the MAF fails more often without EGR and especially with an agressive remap
no benefits if the MAF is functioning correctly as there are no benefits of putting a new MAF if it fails without EGR fitted
i have an improvised bench made from old harnesses as i can emulate the Td5 management's inputs/outputs like they are in reality and the outputs to the wastegate modulator and injector management are the same with this mod like with a new MAF even if there are small differences in the inputs...when i said "linear" i didnt mean graphicly cos i know that this way is quite logaritmic..i should have said "constant" or something(forgive me english is my third language)
the MAF on Td5 is mainly for EGR controll as the airflow is different than with bypassed EGR cos it's dependent on exhaust gas back pressure too... that's why the engineers used the MAF and this mod is suitable only for de-EGR'd cars... with only unplugged MAF the ECU goes on a default value which is not the best, so does if the MAF has erratic inputs... this mod is tested and working well without any problems and it's an option for those who can't afford to put a new MAF once a year cos there are cases when the MAF fails more often without EGR and especially with an "agressive" remap cos due to the constant airflow which is not restricted by the EGR the filament is exposed to more cooling all the time and wears out faster
cos it goes on a fix default mode which will affect consumption ...the MAF is mainly for EGR controll but the management will take into account the fact that there's an open circuit code logged on the airflow circuit...which doesnt happen with this mod... maybe i can't explain perfect in english but it's verified live and the engine runs better with this mod than with unplugged MAF
the MAF has nothing to do with the transmission as it's signal is not part of the CAN... it can affect the transmission management only if it affects the engine power... this mod doesnt
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YarnMaster
, this thing was invented by me and first tested on my own car, it's a 10 minute job... since then some other guys have done it too and everybody is pleased...there's no risk for the engine and if the car is de-EGR'd it will work better than with a new genuine MAF, here's the theory:
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